Intake manifold



Nov. 4, 1930.

E. M. DE LONG INTAKE MANIFOLD Filed Sept. 24, 1925 2 Sheets-Sheet l g g Y l/IIIII INVENTOR A'TTORNEY -Nov.' 4, 1930. E. M. DE LONG 0,

f 4 v I INTAKE MANIFOLD Filed Sept. 24, 1925 2 Sheets-Sheet 2 INVENTOR EVEBETT M D: Lo

' 1 "Patented Nov. 4-, i936 linvnnnrr nn Lone, onlnarnforr, MICHIGAN" INTAKE Maureen) I fnp iication filed September 24, 1-925, Seria1 No. 58,4l1.'

invention relatestto a new and useful improvement in a combination intake manifold and cage unit forinternalcombustion' engines, adapted foruse on internal combus tion engines generally, but especially adapt able for use onth at class of engines which are generally installed on motorcycles.

-LVVith such engines thereis now commonly usedan intake manifold'having a main truck ,p rovided'with a pair of laterally extending r branches,each1of said branches, where a fourr cylinder engine is used, serving as the delivmunicateswith the intake ports of the vari ous cylinders. This isaccomplished by-leadery means fora pair'o'f said cylinders. Many disadvantages are inherentin suchan 'ar,-'

'rangement of intake manifolds, andthe efficiency of the engine-is considerably lessened, while: a compact structure ,is practically impossible.

. In my invention, I have provided anin'talie manifold which serves todeliver, by one main trunk, the gas;intocommunication with all of the'trcyli'nd'ers of the engine, the manifold communicating with "a chamber or passage way, which connectsg'with all ofthe intake ports ofithe engine, Another featureofthe;

invention is the utilization of the wall of the manifold-for heating the gasespreliminarily to its delivery into the chamber, which'coming themanifold exteriorly of the head and permitting it to discharge into the chamber mentioned, substantially centrally, of the head, so that the incoming gases are brought into,-contact with. a wall extending substantiallyoneehalf theilength of the head, this wall being heated by the exploding gases, as a erably of cast metal, and provided with radi atingfins for cooling purpose-s. Vith air cooled engines of this type, it has been'cus tomalry toform the cylinders separately from each other. Such a structure requiresindi vidualheads and cag es for the cylinders,

with separate gaskets for leach cylinder.

facture, less efiicient from a manufacturing and" practical standpoint than c an operative device in which the cylinders are cast ina single'block. To provide such a structure,

Such a, structure is more expensive to'manuwhich is operative and free from many ofthe disadvantages of the multiple structure, is an object of the present invention. To this end, I have provided a head which is unitary and carries with it the valve cage, so that the head serves as a combined manifold and cage This permits the use of a single gasketbetween the head and the. cylinder block. The specific" structure and method .of delivering V the gasintoqthe headserves to make thedevice operative an air 1 cooled engine. In this connectlon, the heat ng of the gases serving to cool theieng ne, prevents distortionand is. a

desirable featurein this structure for age, T cal purposes Therefore, the object of themvention is to provide an air cooled multi-cyL inder engine having a combined manifold and cage unitary structure,,so arranged as to prevent distortion andprov e practically opera-l tive while at the same time combining conij durabihty, and economy of manu-V- facture;

pactness,

Other, obj eets will appear hereinafter,

K The invention consists in the combination and arrangement of parts hereinafter de-, scribed, and claimed,

The invention will bebest understood from a reference :to theaccompanylng drawings,=

form a P O his specification and n.-whieh',* r vc Fig.1 is a partinsectio1 1,v V I v .7 Fig, 2 is a sectional view, taken on substantially line 2T2 of Fig. 1, r

Fig. 3

7 ide elevationalvi w of the even tlon, with a part broken awayandwith a 's vaitopplan'view, showing parts broken away and parts in section. 1

l n the preferred form, as shown in the drawings, there is provided a cylinder block 7 4 in which are formed a number of cylinders 8,

each having. a Cylinder Wall 9. Fins lO are mounted on the-cylinder block for radiating.

purposes. A head 11 is provided for the j V cylinder block, head 11 being provided,

substantially throughout its length, with a longitudinally extending passage or chamber 12, with which, at substantially the center thereof, communicates an intake pipe or conduit 13, the wall 14 serving to separate the pipe 13 from the passage '12 at one side. The pipe 13 is provided with a flared end as shown at 15 in Fig. 8. It will also be noted from Fig. 1, that the pipe 13 inclines downwardly.

' fastening the head to the block 7. Extending outwardly from the head 11, at one side thereof, so as to cover the cylinders 8, is a combustion chamber forming portion p 17 Formed onjthe head 11 and extending into the chamber 12 is a guide boss 18, in which is positioned, preferably by press fit, a guide sleeve 19 for the reception of the valve stem 20, carrying the valve 21, adapted for engaging the valve'seat 22, so as to control communication between the chamber or passage 12, and the space below the valve 21. It is evident that upon opening of the valve 21, the chamber 12 will be in communication with the space or chamber 28, which is positioned over the cylinder 8, so as to permit the entrance of the combustible fHQl lntO the cylinder 8 from the chamber or passage 12.

An opening 23 is formed in the head 11 for the reception of the spark plug. As shown in Fig. '1, the head is provided with a passage way 24 for the mounting of the push rod or operating lever, which is designed to operate the valve 21; Exhaust conduits 25 are mounted on the cylinder block and formed preferably integral therewith, these exhaust conduits communicating through the opening 26 with the space beneath the valve 21. A gasket 27 is positioned between the head 11 and the block 7 With this structure asingle gasket is used. As shown in Fig. 2, there is provided an opening 29, through which a valve stem may project from the valve, arranged to engage the valveseat 29, this valve being designed to control the exhaust. The

valve and its operating structures are not shown as they are of a well known type and form no specific part of this invention.

With such an arrangement, the fuel is delivered into the chamber 12, through the pipe 13, in its passage into this chamber, in coming into contact with the wall 14 and becoming preheated.

It is evident that the heat'taken up by the incoming gas will lower the temperature of the wall 14 and assist in cooling. As the gas enters the chamber or passageway 12, it has free access to all of the intake ports of the various cylinders and from practical opera-- tion,it has been demonstrated that the structure, as shown, is one which will serve to deliver thefuel to the cylinders uniformly without delivering an insufiicient amount to the end cylinders and an excess amount to the centrally positioned cylinder. It is obvious that in assembling this device, a compact structure will be provided and much time saved overthe time necessary to assemble the heads and cage units on engines in which the cylinders are formed separately and in which the cage unit is not combined with the manifold. v

lVhile I have illustrated and described the preferred form of structure, I do not wish to limit myself to the precise form of structure shown, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters.

Patent is Y '1. In combination with an internal combustion engine ha-ving'a cylinder block provided with a plurality of'cylinders, a unitary head adapted for mounting on said block, said head having a longitudinally extending chamber formed therein, the under surface of said head being spaced from the upper surface of said block throughout the major por tion of its area to provide a plurality of chambers each in communication with one of said cylinders, said longitudinal extending chambercommunicating with inlet ports with .eachof said cylinder communicating chambers; an exhaust conduit for each of said cylinders insaid block and opening beneath said inlet port into said cylinder communicating chambers; a valve'cage mounted on and integral with said head; an intake conduit integral with said head and extending longitudinally thereof throughout substantially one-half its length and communicating with said longitudinally extending chamber, said longitudinally extending chamber lying intermediate the axial line of said intake conguit and said cylinder communicating chamers. I a r 2. In combination with an internal com bustion engine having a cylinder block pro vided with a plurality of cylinders, a head adapted for mounting on said block, said head having a longitudinally extending chamber formed therein,adjacent one side thereof,,sai-d head being provided with a plurality of combustion chamber forming portions, each seated over one of said cylinders and spaced upwardly from the end munication with one of said cylinders, said thereof to provide a chamber, each in com- 7 longitudinally extending chamber communieating through inlet ports with each of said cylinder. communicating chambers, said head I tending chamber, adjacent its center, said 1101 being provided with an exhaust port opening beneath said inlet port into said cylinder communicating chambers; and an intake manifold on said head, said intake manifold communicating with said longitudinally exlongitudinally extending chamber lying intermediate the axial line of said intake manifold and said combustion chamber forming portions. l g In testimony whereof, I have signed'the foregoing. EVERETT M. DE LONG. 

